because I don't have room physically for extra parts and SPI is generally not fast enough for me. Al otc_friend wrote: > Why not use an external AD connected via SPI interface on LPC2106?! Surely > there is a 8-pin device available on the market. > > - Henry > > > <Schau auch mal auf meine Homepage www.ehydra.dyndns.info> > <u.a. Versand von Wasserflohzuchtansatz, Wasserpflanzen/-schnecken, > Futteralge Chlorella, brasilianischer Sauerklee, Natron zum Backen/Baden, > Chemikalien u.a.> > <Alternativ \ufffdber http://people.freenet.de/algenkocher> > > > -----Urspr\ufffdngliche Nachricht----- > Von: lpc2100_fan <lpc2100_fan@...> > An: lpc2000@yahoogroups.com <lpc2000@yahoogroups.com> > Datum: Donnerstag, 16. Dezember 2004 18:21 > Betreff: [lpc2000] Re: Compatibility > > > > > > > >Hi Al, > > > >from what you are describing you might want to have a look at Silicon > >Labs. They have fast 8-bit micros with high resolution ADCs. The > >problem might be that you pay as much for an 8-bit micro as you pay > >for the low end ARM micros. > >I don't know why you mentioned that you have to go to the high end ARM > >offerings with Philils to find an ADC. The LPC2131, the entry level > >for ARM from Philips has a 10-bit 8 channel ADC. You are right that it > >also has many communication ports. > >Let me give you some background information (I am involved in chip > >design) about the reason why there are so many serial channels while > >the ADC is, let's say OK but not great. > >1. In advanced technologies, serial channels are very small and > >getting smaller every day. This is very different with ADCs, they do > >not get smaller, actually for many processes they even have to be > >bigger using most advanced processes. So, one good 10-bit ADC might be > >as big as 2 UARTs + 2 I2Cs + 2 SPIs!? > >2. Different user, different serial interface. You like a UART (so do > >I) but many engineers use SPI or some I2C. Missing one of them might > >disqualify the micro for a large range of applications. > >3. The most appealing part of the new generation of ARM micros is the > >price performance ratio. You are in need for speed, so are many > >others. A package of 8x8mm providing you 32k Flash, 8k RAM, 8 channels > >10-bit ADC running 60 MHz (almost) 0 Wait states from Flash. > > > >Summary: > >Your needs are probably best met by the AD devices (although they are > >much slower from Flash and have a miserable Interrupt controller. The > >AD device is a great ADC with a not so great microcontroller attached > >to it ;-) > > > >Hope you find the best device for you. > > > >Cheers Bob > > > >--- In lpc2000@yahoogroups.com, onestone <onestone@b...> wrote: > >> Hi Bill, thanks. The problem is that, according to the AD website their > >> ARM7 offering isn't available yet, It looks the part, still has more > >> memory than I want, and more peripherals, but a far better mix for my > >> needs (actually all I want is an eight pin part with 2 * A/D, 2 * DACs, > >> stable clock, internal timers, at 50mA the current is a bit high, and I > >> assume that is core only, not all peripheals running, but I can live > >> with that, it still figure I'll get a week between recharges. I'll keep > >> my eyes open for parts becoming available, in the meantime it will be > >> worth while using the LPC to try and ARMour myself. > >> > >> Cheers > >> > >> Al > >> > >> Bill Knight wrote: > >> > >> > Al > >> > You might want to take a look at the Analog Devices ADuC700 series > >> > ARM offerings. They may be more in line with what you are seeking. > >> > > >> > > >http://www.analog.com/en/content/0%2C2886%2C117%255F%255F31068%2C00.html > >> > > >> > Regards > >> > -Bill Knight > >> > > >> > PS - welcome to the ARM side of things > >> > > >> > > >> > On Thu, 16 Dec 2004 11:00:48 +1030, onestone wrote: > >> > > >> > > >> > Hi Kris, I'm not even sure the ARM is what I want. It seems > >underdone - > >> > overkill if you see what I mean. Not as bad as some other ARM devices, > >> > but still too much of some things and not enough of others. > >> > > >> > The smallest part has 8k RAM, and 32k flash IIRC. Even the tiniest > >parts > >> > have more comms interfaces than NASA, But you have to get to > >really big > >> > parts to get an ADC, and even then it's only 10 bits. To me it's > >XA'ish. > >> > A good idea done badly. Philips rationale for low res ADC is that on > >> > chip noise makes anything more useless. Its odd that most other > >vendors > >> > don't have problems here, By the time I get an ADC I've got 2 UARTs, 2 > >> > SPI's IIC, a CAN of worms, and who knows what other comms interfaces > >> > eating up the silicon. I don't want comms. I want to process sensor > >> > data. maybe 1 UART would be fine. An SPUI or IIC as well. Sure it's 32 > >> > bit, that doesn't mean it has to be a mammoth. The only reason I'm > >> > looking at the ARM is it's flash base and higher execution speeds. > >> > Couple that with 32 bit processing (which I could live without) > >for fast > >> > calcs. It also is quite low current for what it can do. So I don't see > >> > it as anything more than an 8 bitter that has faster bigger number > >> > crunching. Every one of the top micro suppliers, in terms of volume, > >> > makes a large part of their market through small devices, low pin > >count. > >> > basically that's what I want. a 20 pin device that is damned fast, and > >> > which eats numbers, without sucking the sort of juice that a DSP does. > >> > So I'd be happy with 8K of flash, 2k of RAM, 4 A/D channels at 12 bits > >> > or better, 8 capture compares, 1 UART, 1 SPI/IIC. 60MHz, slower I/O is > >> > fine. I just want the built in multiplier. Philips don't even come > >close > >> > on their road map. > >> > > >> > So, although I'm having a look I don't see much of a future in it for > >> > me. There are better, lower cost options on the horizon, that approach > >> > the same processing speeds, at lower currents, with a more > >rational (for > >> > me) peripheral/memory mix. > >> > > >> > Al > >> > > >> > microbit wrote: > >> > > >> > > Hey Al, > >> > > > >> > > Nice to meet here :-) > >> > > The J-link outputs onto the standard 20 pin JTAG, and should just > >> > > drop into the 20 pin JTAG on MCB2100. > >> > > > >> > > -- Kris > >> > > > >> > > > Can anyone tell me if the J-Link unit that comes with the > >IAR tools is > >> > > > compatible with the MCB2100 board from Keil, please. > >> > > > > >> > > > Cheers > >> > > > > >> > > > Al > >> > > >> > > >> > > >> > > >> > Yahoo! Groups Sponsor > >> > ADVERTISEMENT > >> > > ><http://us.ard.yahoo.com/SIG=1290pot13/M=295196.4901138.6071305.3001176/D=g > roups/S=1706554205:HM/EXP=1103245757/A=2128215/R=0/SIG=10se96mf6/*http://com > panion.yahoo.com> > >> > > >> > > >> > > >------------------------------------------------------------------------ > >> > Yahoo! Groups Links > >> > > >> > * To visit your group on the web, go to: > >> > http://groups.yahoo.com/group/lpc2000/ > >> > > >> > * To unsubscribe from this group, send an email to: > >> > lpc2000-unsubscribe@yahoogroups.com > >> > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > >> > > >> > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > >> > Service <http://docs.yahoo.com/info/terms/>. > >> > > >> > > > > > > > > > > > > > > > > >Yahoo! Groups Links > > > > > > > > > > > > > > > > > Yahoo! Groups Sponsor > ADVERTISEMENT > <http://us.ard.yahoo.com/SIG=129r4n7fp/M=295196.4901138.6071305.3001176/D=groups/S=1706554205:HM/EXP=1103635257/A=2128215/R=0/SIG=10se96mf6/*http://companion.yahoo.com> > > > ------------------------------------------------------------------------ > Yahoo! Groups Links > > * To visit your group on the web, go to: > http://groups.yahoo.com/group/lpc2000/ > > * To unsubscribe from this group, send an email to: > lpc2000-unsubscribe@yahoogroups.com > <mailto:lpc2000-unsubscribe@yahoogroups.com?subject=Unsubscribe> > > * Your use of Yahoo! Groups is subject to the Yahoo! Terms of > Service <http://docs.yahoo.com/info/terms/>. > >
Message
Re: [lpc2000] Re: Compatibility
2004-12-20 by onestone